Aeration pipe unit



FIG. 1 is a perspective view of an aeration pipe unit showing our newdesign;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left right side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines are for the purpose of illustrating portions of theaeration pipe unit and form no part of the claimed design.

The ornamental design for an aeration pipe unit, as shown and described.